Vertical falling film system

The utility model relates to a vertical falling film system. The vertical falling film system comprises preheating equipment, a circulating pump, a heater, a falling film evaporator and a separator. Wherein the preheating equipment is used for preheating material water, the circulating pump is used for continuously pumping the preheated material water to the heater according to a preset flow, the heater is used for heating the material water to a preset temperature, and the tube pass is used for heating the material water to a preset state; the separator is used for separating high-temperature steam in material water in a preset state from unevaporated material water, and the shell pass is used for exchanging heat with the material water in the tube pass by utilizing the separated high-temperature steam, so that the material water in the tube pass is heated to the preset state, and the high-temperature steam is condensed into high-temperature injection water. The circulating pump can ensure that enough materi